A130065 - cp's OEIS frontend

A130065 a(n) = (n / GreatestPrimeFactor(n)) * SmallestPrimeFactor(n).

n	a(n)
1	1
2	2
3	3
4	4
5	5
6	4
7	7
8	8
9	9
10	4
11	11
12	8
13	13
14	4
15	9
16	16
17	17
18	12
19	19
20	8
21	9
22	4
23	23
24	16
25	25
26	4
27	27
28	8
29	29
30	12
31	31
32	32
33	9
34	4
35	25
36	24
37	37
38	4
39	9
40	16
41	41
42	12
43	43
44	8
45	27
46	4
47	47
48	32
49	49
50	20
51	9
52	8
53	53
54	36
55	25
56	16
57	9
58	4
59	59
60	24
61	61
62	4
63	27
64	64
65	25
66	12
67	67
68	8
69	9
70	20
71	71
72	48
73	73
74	4
75	45
76	8
77	49
78	12
79	79
80	32
81	81

[1, 2, 3, 4, 5, 4, 7, 8, 9, 4, 11, 8, 13, 4, 9, 16, 17, 12, 19, 8, 9, 4, 23, 16, 25, 4, 27, 8, 29, 12, 31, 32, 9, 4, 25, 24, 37, 4, 9, 16, 41, 12, 43, 8, 27, 4, 47, 32, 49, 20, 9, 8, 53, 36, 25, 16, 9, 4, 59, 24, 61, 4, 27, 64, 25, 12, 67, 8, 9, 20, 71, 48, 73, 4, 45, 8, 49, 12, 79, 32, 81]

cp's OEIS Frontend

A130065 a(n) = (n / GreatestPrimeFactor(n)) * SmallestPrimeFactor(n).

Table of values

List of values

n	a(n)
1	1
2	2
3	3
4	4
5	5
6	4
7	7
8	8
9	9
10	4
11	11
12	8
13	13
14	4
15	9
16	16
17	17
18	12
19	19
20	8
21	9
22	4
23	23
24	16
25	25
26	4
27	27
28	8
29	29
30	12
31	31
32	32
33	9
34	4
35	25
36	24
37	37
38	4
39	9
40	16
41	41
42	12
43	43
44	8
45	27
46	4
47	47
48	32
49	49
50	20
51	9
52	8
53	53
54	36
55	25
56	16
57	9
58	4
59	59
60	24
61	61
62	4
63	27
64	64
65	25
66	12
67	67
68	8
69	9
70	20
71	71
72	48
73	73
74	4
75	45
76	8
77	49
78	12
79	79
80	32
81	81

n	a(n)
1	1
2	2
3	3
4	4
5	5
6	4
7	7
8	8
9	9
10	4
11	11
12	8
13	13
14	4
15	9
16	16
17	17
18	12
19	19
20	8
21	9
22	4
23	23
24	16
25	25
26	4
27	27
28	8
29	29
30	12
31	31
32	32
33	9
34	4
35	25
36	24
37	37
38	4
39	9
40	16
41	41
42	12
43	43
44	8
45	27
46	4
47	47
48	32
49	49
50	20
51	9
52	8
53	53
54	36
55	25
56	16
57	9
58	4
59	59
60	24
61	61
62	4
63	27
64	64
65	25
66	12
67	67
68	8
69	9
70	20
71	71
72	48
73	73
74	4
75	45
76	8
77	49
78	12
79	79
80	32
81	81

n	a(n)
1	1
2	2
3	3
4	4
5	5
6	4
7	7
8	8
9	9
10	4
11	11
12	8
13	13
14	4
15	9
16	16
17	17
18	12
19	19
20	8
21	9
22	4
23	23
24	16
25	25
26	4
27	27
28	8
29	29
30	12
31	31
32	32
33	9
34	4
35	25
36	24
37	37
38	4
39	9
40	16
41	41
42	12
43	43
44	8
45	27
46	4
47	47
48	32
49	49
50	20
51	9
52	8
53	53
54	36
55	25
56	16
57	9
58	4
59	59
60	24
61	61
62	4
63	27
64	64
65	25
66	12
67	67
68	8
69	9
70	20
71	71
72	48
73	73
74	4
75	45
76	8
77	49
78	12
79	79
80	32
81	81